Hanover County, Virginia · Hanover Courthouse
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With 11% of homes built before 1960 and about 12 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
June brings the most downpours to Hanover County, part of 10.7 heavy-rain days a year. Check the sump first.
11% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
In Hanover County, 4.46 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
6% of occupied homes in Hanover County heat mainly with wood or propane, below the Virginia county median of 11.9%.
With 72 muggy nights a year, mold in Hanover County can appear within days of a leak. Dry first, then clean.
Local risk profile
Hanover County covers 468 square miles of eastern Virginia, with about 112,879 residents and 44,589 homes. Hanover Courthouse is the county seat; Mechanicsville, Ashland and Hanover are the next largest communities. Much of its housing is recent, with a median build year of 1991.
42/100 Water Damage Risk Index: Moderate Hanover County ranks 71 of 95 Virginia counties. See the statewide ranking and method.The three factors where Hanover County ranks highest compared with other Virginia counties.
For frozen pipes, Hanover County is a typical Virginia county, which is still plenty. It averaged 80 freezing nights a year over 2015–2024, 12 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 95 Virginia counties that's 55th.
On January 7, 2018 the low fell to about -3°F, and in the stretch ending February 2016 the county went 4 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
The freeze season here runs December to February, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Nov 4 and the last spring freeze around Apr 8.
Heavy rain is a bigger factor here than in most of Virginia. About 10.7 days a year bring an inch or more (31st of 95), most often in June, out of 48.1 inches of total precipitation. On October 12, 2018, 4.46 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 7.09 inches (through May 19, 2018).
The temperature crosses 32°F in both directions on roughly 77 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
32% of homes in Hanover County predate 1980, below the Virginia county median of 46.2%, which ranks 74th of Virginia's 95 counties.
Growth since 2000 added 31% of today's homes. In houses that new, the weak points are washing machine hoses, ice maker lines, water heaters and sump pumps rather than the pipes in the walls.
37% date from 1980 to 1999, the window when polybutylene, a gray flexible plastic supply pipe, was used in some homes. It's prone to leaks at the fittings, so it's worth checking for in a house from those years.
Beyond water
Hanover County averages 72 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in August. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectBy main heating fuel, Hanover County homes break down as 20% utility gas, 70% electric, 4% propane and 2% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Hanover County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Goochland, Louisa and Spotsylvania get more pipe-freeze nights than Hanover. Henrico County has the oldest housing nearby, with 41% of homes built before 1980.
By the numbers
| Factor | Hanover | Virginia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 11% | 20% | 81 of 95 |
| Homes built before 1980 | 32% | 46% | 74 of 95 |
| Homes built 2000 or later | 31% | 25% | 28 of 95 |
| Manufactured or mobile homes | 1.9% | 9.6% | 82 of 95 |
| Vacant homes | 4.3% | 15% | 89 of 95 |
| Wood or propane heat | 6% | 12% | 82 of 95 |
| Nights at 20°F or colder | 12/yr | 14/yr | 55 of 95 |
| Days with 1 inch+ of rain | 11/yr | 10/yr | 31 of 95 |
| Freeze-thaw days | 77/yr | 77/yr | 46 of 95 |
| Muggy nights (65°F+) | 72/yr | 64/yr | 36 of 95 |
Rank 1 is the highest value. Bars run from the lowest to the highest Virginia county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Hanover County: freezing from December to February, heavy rain in June, September and October.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology